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Fig 4 - Self-organization of biological morphogenesis: General approaches and topo-geometrical models

8 Main morphomechanical feedbacks. A 1-A 4 Expected tissue deformations under the action of a contraction-extension (CE) feedback. B 1-B 2 A curvature-increasing (CI) feedback. C Same feedback acting upon a lip. D Extension-extension (EE) feedback. Blue bent arrows indicate a succession of the unit actions upon each other. E Same feedback producing a cell fan with increased inclination of structural elements. Blue arrows depict passive deformations and red arrows active ones. Dotted lines in A 4 and B 2 outline subsequent deformations. Curved black arrows in B 2 show the expected flow of cell material from concave to convex side of an arisen curvature
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